diff --git a/doc/api/repl.md b/doc/api/repl.md
index eb32f2c2b2755b..1b03ba47a25d99 100644
--- a/doc/api/repl.md
+++ b/doc/api/repl.md
@@ -418,6 +418,15 @@ added: v0.1.91
 
 The `repl.start()` method creates and starts a `repl.REPLServer` instance.
 
+If `options` is a string, then it specifies the input prompt:
+
+```js
+const repl = require('repl');
+
+// a Unix style prompt
+repl.start('$ ');
+```
+
 ## The Node.js REPL
 
 Node.js itself uses the `repl` module to provide its own interactive interface